package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

/**
 * 菜品业务接口实现
 * @author wzplove
 */
@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入一笔数据
        dishMapper.insert(dish);

        //获取生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && !flavors.isEmpty()){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n笔数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断菜品是否在起售中，如果在起售中，则不可删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)) {
                //如果菜品状态为起售中，则不可删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断菜品是否关联了套餐，如果关联了套餐，则不可删除
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishId(ids);
        if (setmealIds != null && !setmealIds.isEmpty()) {
            //如果菜品关联了套餐，则不可删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //根据菜品id集合，批量删除菜品数据
        dishMapper.deleteByIds(ids);
        //根据菜品id集合，批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 根据id查询菜品和对应的口味数据
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //查询菜品数据
        Dish dish = dishMapper.getById(id);
        //查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //封装数据到DishVO中并返回
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品和对应的口味
     */
    @Override
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //修改菜品表，执行update
        dishMapper.update(dish);
        //删除菜品口味表中原来的数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新添加新的菜品口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //添加新的菜品口味数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 起售停售菜品
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        log.info("起售停售菜品，id：{}，status：{}", id, status);
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    //===============================C端-用户端==========================================
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    @Override
    @Transactional
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
